Well, if you are a REAL audiophile, enough is never enough. You need at least 6 megahertz of bandwidth to get close to real. Why 6 mhz? Because anything less is less. 6 mhz is lower end video. You can see what you hear. So a sample rate of 12,000 khz is the minimum to get close. Presently available digital audio rates are perhaps (and I use the term advisedly) perhaps equal to pretty good cassette. We need not mention LP with its infinite sample rate.